What customer retention rate measures
Customer retention rate is the share of customers you had at the start of a period who are still paying at the end of it. It answers one question: of the people who already bought, how many stayed? Churn rate is the other side of the same number, so 95% retention means 5% churn.
Retention matters because every customer who stays keeps paying without a new sales effort. A business that keeps more of its customers grows faster from the same amount of acquisition, and its revenue is easier to forecast.
How to calculate retention rate
Take the customers you have at the end of the period, subtract the new customers you won during it, and divide by the customers you started with:
- Customers at the start of the quarter: 1,000
- Customers at the end of the quarter: 1,030
- New customers won during the quarter: 80
- Retention rate = (1,030 − 80) ÷ 1,000 = 95.0%
So 950 of your 1,000 starting customers stayed and 50 left, a churn rate of 5.0%. If you already know how many customers cancelled, switch the calculator to Lost: retention is then (1,000 − 50) ÷ 1,000, which gives the same 95.0%.
Why new customers are left out
The customer count went up from 1,000 to 1,030, which looks like everyone stayed and more arrived. It hides 50 cancellations. Retention only measures the people you started with, so new customers come out before you divide.
Two more rules keep the number honest. Use the same definition of a customer at the start and the end (paying accounts, not free users or trials). And measure every number over the same period: a customer who joins and cancels inside the same quarter counts as new but not as retained, so they lower the ending count without touching the starting one.
Monthly, quarterly and annual retention
Retention compounds. Each month you keep a share of a slightly smaller base, so you can't multiply or add rates across periods. To convert:
- Annual retention = quarterly retention⁴, or monthly retention¹²
- 95.0% a quarter is 0.95⁴ = 81.5% a year
- 95.0% a quarter is about 98.30% a month
Of the 1,000 starting customers, about 815 would still be active after 12 months if the rate held. The calculator's cohort row shows that month by month. It also turns the monthly churn into an average customer lifetime: 1 ÷ 1.70% is about 59 months.
With small numbers, a single month can swing a lot. Losing 2 of 40 customers is 95% retention; losing none the next month is 100%. Look at three to six months together before drawing conclusions.
Customer retention vs revenue retention
Customer retention counts accounts. Revenue retention counts money. Gross revenue retention (GRR) is recurring revenue at the start, minus revenue lost to cancellations and downgrades, divided by revenue at the start.
In the example, $4,800 lost from $120,000 of MRR is 96.0% revenue retention, a little higher than the 95.0% customer retention. That means the customers who left were smaller than average. When revenue retention is lower than customer retention, larger accounts are leaving or downgrading, and that's where to look first. Add expansion revenue on top and you get net revenue retention.
How to improve customer retention
- Get new customers to a first result quickly. The first weeks after signing up are when most customers decide whether to stay.
- Recover failed payments. Expired cards cause churn nobody chose, and retries and reminder emails win much of it back.
- Watch usage. Fewer logins and unused seats usually come before a cancellation.
- Ask why people leave. A short cancellation question tells you whether the problem is price, product or fit.
- Sell to customers who fit. Many retention problems start with customers who were never a good match.
Related tools
Measure the other side of this number with the Churn Rate Calculator, add expansion revenue with the NRR Calculator, and turn customer lifetime into value with the SaaS LTV Calculator. To win more customers who are likely to stay, see our services.